Sorry, I'd actually have to disagree... If you compare the HX series with the XFX new PSUs. The 750watt XFX Black edition is actually the same price as the 650HX.
So you get 100 more watts for the same price. Also, the thing is, the 650HX is only bronze 80+ while the XFX is silver 80+, just saying i'd recommend the XFX 750 if your going with the HX series.